Scrabble game using machine learning
Scrabble was solved using reinforcement learning achieving super-human performance. If you are interested, you can start reading about it here: https://en.wikipedia.org/wiki/Maven_(Scrabble)#cite_note-1 

You can also read about it here: http://www0.cs.ucl.ac.uk/staff/d.silver/web/Teaching_files/games.pdf (there're several slides about Maven)